一、前言解放后我国农田基本建设有很大发展,有不少群众自己设计的挡土墙,结构尺寸选比我们计算需要的小,原因很多,其中一个主要原因是:我们现在采用的土压力计算方法(指主动土压力,下同),如:库伦和兰金公式,雷朋汉作图法、楔体试算法等等,都有一个共同的假定,即假定挡土墙是无限长的,因此在计算挡土墒的土压力时,并不考虑土体两侧所受的剪应力或摩阻力,即图一中的T,他们都假定为零。事实上不会有无限长的挡土墙,土体两侧的剪应力或摩阻力不会等于零。若用 First, the preface The liberation of our country farmland capital construction has great development, there are many masses own design retaining wall, the structure size of choice than we need to calculate the small, for many reasons, one of the main reasons are: we now use the earth pressure The calculation method (referring to the active earth pressure, the same below), such as: Coulomb and Rankin formula, Ray Penhan mapping method, wedge test algorithm, etc., have a common assumption that the retaining wall is infinitely long Therefore, when calculating the soil pressure of retaining soil moisture, it does not consider the shear stress or friction resistance on both sides of the soil, that is, T in Figure 1, they are assumed to be zero. In fact, there will be no infinite retaining wall, and the shear stress or frictional resistance on both sides of soil will not be equal to zero. If used